More oil you add to the fuel the richer it is less oil means you leaning the fuel out. Your better off with a slightly richer mix than a leaned out mix you have to remember a 2 stroke needs the oil. I know people that run to rich of a oil mix and it does cause problems when I see people running 32 to 1 in a saw that requires 50 to 1 isn't a good idea. The saw shops I deal with both told me run close to a 50 to 1 mixture like the one shop told me 48 to 1 is good. They also told me run the Stihl oil its all what the fallers and loggers use here in their saws. When a faller makes their lively hood with their chainsaw they use what is proven and what will give the saw the most life. Most fallers do buy a couple saws a year mostly 066 and 046. As for Amsoil I don't trust it who ever says they can run the fuel mixture at 100 to 1 forget it I'am going to stick with what is proven. I used to make part of my living with my saws doing some thinning and bucking.